Gas Absorption - Absorption of Carbon Dioxide from Air by Sodium and Potassium Hydroxides.

Blum, H. A.; Stutzman, Leroy F.; Dodds, W. S.

doi:10.1021/ie50516a053

Cited by 22 publications

(11 citation statements)

References 4 publications

(4 reference statements)

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“…Initial attempts centered on known, existing technologies for CO 2 removal from air. The older literature dating back to the 1940s and 1950s describes numerous studies evaluating the extraction of CO 2 from dilute gases such as the air via aqueous, basic absorption processes (139)(140)(141). In 1977, Steinberg & Dang (142) evaluated eight methods for the extraction of CO 2 from the atmosphere for the purpose of converting the CO 2 into fuels or chemicals.…”

Section: Direct Capture Of Co 2 From Ambient Air: Air Capturementioning

confidence: 99%

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Jones

2011

Annu. Rev. Chem. Biomol. Eng.

236

185

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The growing atmospheric CO(2) concentration and its impact on climate have motivated widespread research and development aimed at slowing or stemming anthropogenic carbon emissions. Technologies for carbon capture and sequestration (CCS) employing mass separating agents that extract and purify CO(2) from flue gas emanating from large point sources such as fossil fuel-fired electricity-generating power plants are under development. Recent advances in solvents, adsorbents, and membranes for postcombust- ion CO(2) capture are described here. Specifically, room-temperature ionic liquids, supported amine materials, mixed matrix and facilitated transport membranes, and metal-organic framework materials are highlighted. In addition, the concept of extracting CO(2) directly from ambient air (air capture) as a means of reducing the global atmospheric CO(2) concentration is reviewed. For both conventional CCS from large point sources and air capture, critical research needs are identified and discussed.

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Section: Direct Capture Of Co 2 From Ambient Air: Air Capturementioning

confidence: 99%

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Jones

2011

Annu. Rev. Chem. Biomol. Eng.

236

185

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“…Since Lackner first introduced the concept of using air capture as a mode of reducing the global atmospheric CO 2 concentration, there have been several reports of potential approaches for capturing CO 2 from the air. These include solution processes based on CO 2 absorption in aqueous alkaline media [5][6][7][8][9][10][11] (first studied over 50 years ago for different purposes [12][13][14] ), application of solid alkali hydroxides as adsorbents at high temperatures, [15] and more recently, application of solid adsorbents operating at low temperature, based on quaternary ammonium resins [16] or silica-supported amines. [17][18][19] One of the challenges in developing methodologies for the direct capture of CO 2 from ambient air is identifying sorbents with large CO 2 capacities even under ultra-dilute operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Amine‐Tethered Solid Adsorbents Coupling High Adsorption Capacity and Regenerability for CO₂ Capture From Ambient Air

2011

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Silica supported poly(ethyleneimine) (PEI) materials are prepared via impregnation and demonstrated to be promising adsorbents for CO(2) capture from ultra-dilute gas streams such as ambient air. A prototypical class 1 adsorbent, containing 45 wt% PEI (PEI/silica), and two new modified PEI-based aminosilica adsorbents, derived from PEI modified with 3-aminopropyltrimethoxysilane (A-PEI/silica) or tetraethyl orthotitanate (T-PEI/silica), are prepared and characterized by using thermogravimetric analysis and FTIR spectroscopy. The modifiers are shown to enhance the thermal stability of the polymer-oxide composites, leading to higher PEI decomposition temperatures. The modified adsorbents present extremely high CO(2) adsorption capacities under conditions simulating ambient air (400 ppm CO(2) in inert gas), exceeding 2 mol(CO (2)) kg(sorbent)(-1), as well as enhanced adsorption kinetics compared to conventional class 1 sorbents. The new adsorbents show excellent stability in cyclic adsorption-desorption operations, even under dry conditions in which aminosilica adsorbents are known to lose capacity due to urea formation. Thus, the adsorbents of this type can be considered promising materials for the direct capture of CO(2) from ultra-dilute gas streams such as ambient air.

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“…[20,21] One example is the use of metal oxides and hydroxides that can capture CO 2 by chemical reaction to form solid carbonates. [22][23][24][25][26][27] However, the high temperatures typically required for their regeneration is a disadvantage for the two CO 2 capture applications considered here. Alternatively, a variety of porous solids have also been developed and used for such CO 2 capture applications.…”

Section: Introductionmentioning

confidence: 99%

Aminosilanes Grafted to Basic Alumina as CO₂ Adsorbents—Role of Grafting Conditions on CO₂ Adsorption Properties

et al. 2014

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Solid oxide-supported amine sorbents for CO2 capture are amongst the most rapidly developing classes of sorbent materials for CO2 capture. Herein, basic γ supports are used as hosts for amine sites through the grafting of 3-aminopropyltrimethoxysilane to the alumina surface under a variety of conditions, yielding the expected surface-grafted alkylamine groups, as demonstrated by FTIR spectroscopy and (29)Si and (13)C cross-polarization magic-angle spinning (CPMAS NMR) spectroscopy. Grafting amine sites on the surface in the presence of water leads to a high density of amine sites on the surface whereas simultaneously creating a unique type of aluminum species on the surface, as demonstrated by both 1D and 2D (27)Al MAS NMR spectroscopy. The thus prepared sorbents result in higher CO2 adsorption capacities and amine efficiencies compared to sorbents prepared in the absence of water or similar amine loading sorbents prepared using silica supports. In situ FTIR spectra of the sorbents exposed to CO2 at various pressures show no distinct difference in the nature of the adsorbed CO2 species on alumina- versus silica-supported amines, whereas water adsorption isotherms show that the improved performance of the amine-grafted alumina support is not a consequence of retained water on the more hydrophobic aminoalumina materials. The findings demonstrate that amine-grafted, basic alumina materials can be tuned to be more efficient than the corresponding silica-supported materials at comparable amine loadings, further demonstrating that the properties of amine sites can be tuned by controlling or adjusting the support surface properties.

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Gas Absorption - Absorption of Carbon Dioxide from Air by Sodium and Potassium Hydroxides.

Cited by 22 publications

References 4 publications

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Amine‐Tethered Solid Adsorbents Coupling High Adsorption Capacity and Regenerability for CO₂ Capture From Ambient Air

Aminosilanes Grafted to Basic Alumina as CO₂ Adsorbents—Role of Grafting Conditions on CO₂ Adsorption Properties

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Gas Absorption - Absorption of Carbon Dioxide from Air by Sodium and Potassium Hydroxides.

Cited by 22 publications

References 4 publications

CO2 Capture from Dilute Gases as a Component of Modern Global Carbon Management

CO2 Capture from Dilute Gases as a Component of Modern Global Carbon Management

Amine‐Tethered Solid Adsorbents Coupling High Adsorption Capacity and Regenerability for CO2 Capture From Ambient Air

Aminosilanes Grafted to Basic Alumina as CO2 Adsorbents—Role of Grafting Conditions on CO2 Adsorption Properties

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CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

CO₂ Capture from Dilute Gases as a Component of Modern Global Carbon Management

Amine‐Tethered Solid Adsorbents Coupling High Adsorption Capacity and Regenerability for CO₂ Capture From Ambient Air

Aminosilanes Grafted to Basic Alumina as CO₂ Adsorbents—Role of Grafting Conditions on CO₂ Adsorption Properties